XT_TCP_INV_OPTION 48 include/uapi/linux/netfilter_ipv4/ip_tables.h #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION XT_TCP_INV_OPTION 48 include/uapi/linux/netfilter_ipv6/ip6_tables.h #define IP6T_TCP_INV_OPTION XT_TCP_INV_OPTION XT_TCP_INV_OPTION 114 net/netfilter/xt_tcpudp.c tcpinfo->invflags & XT_TCP_INV_OPTION,